Abstract

MARQUEZ, José Gregorio  and  GARCIA ROJAS, Carmen Elena. Effect of nisin over the pathogenic microflora of artisan "telita" type white cheese produced at a cheese factory in Upata, Bolivar State, Venezuela. Rev. Soc. Ven. Microbiol. [online]. 2007, vol.27, n.2, pp.108-111. ISSN 1315-2556.

Abstract The inhibitory effect of two nisin concentrations (10.0 and 16.7 mg/kg) over the Staphylococcus aureus, total coliforms, Escherichia coli, Salmonella spp and Listeria monocytogenes population was evaluated in "telita" type white cheese produced at a cheese factory in Upata, Bolivar State. The number of S. aureus, total coliforms and Escherichia coli was determined by inoculation in Petrifilm 3M dry rehydratable films. The S. aureus counts were significantly smaller (p<0.05) in the "telita" cheese samples with the two nisin concentrations tested as compared with the control samples. No Salmonella spp or Listeria monocytogenes were detected in any of the samples analyzed. It was determined that the two nisin concentrations added to the "telita" cheese exerted an inhibitory effect over the S. aureus present in them as contaminant microflora

Keywords : artisan white cheese; nisin; bacteriocin; Staphylococcus aureus.